Gulf worm identification

[wtdenk]

This worm is small. For reference the sponge in the video is about the size of a marble. It mostly always hides in its rock. It came on a piece of gulf rock. It uses it's front antennae/horns to grab little pieces of shells and sticks them to the rock, almost like it's expanding its own burrow in the rock. Any idea?

 

[vetteguy53081]

This worm is small. For reference the sponge in the video is about the size of a marble. It mostly always hides in its rock. It came on a piece of gulf rock. It uses it's front antennae/horns to grab little pieces of shells and sticks them to the rock, almost like it's expanding its own burrow in the rock. Any idea?

Looks like syllidae or uenicid- get rid of it